I read an article that says it happens every 19.6 years, but this is the first time since 1226 that it has happened during earth’s night so we can see it. I don’t understand how that happens that it is only 1 out of the last 42 times it has occurred.
In: Physics
Because they’re not always this close. 19.6 is the periodicity of the moment they’re the closest considering their orbits. Since orbit shapes aren’t perfect, they can be more or less close *in our sky* (they’re still ducking far from one another). And last time they were this close (in the 17th century), the sun was in the way so we couldn’t see.
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